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- New Monk-martyrs Jacinthus Pitatelev and Callistus Oparin, of the St. Nicholas Monastery, Verkhoturye (1918) 17 October
- Venerable Jacob (Jakov, James), Abbot of Stromynsk Monastery, Radonezh (1392) 21 April
- Saint Jacob (James), Bishop of Nisibis, the "Moses of Mesopotamia" (c. 350) 13 January
- New Hieromartyrs Jacob (Maskaev), Archbishop of Barnaul, and Priests Peter Gavrilov and John Mozhirin, and with them Monk-martyr Theodore (Nikitin) and... (1937) 16 July
- Saint Jacob (Putneanul), Metropolitan of Moldova (1778) 2 May
- New Martyr Jacob Blatov (1937) 31 October
- New Hieromartyr Jacob Boikov, Priest (1943) 6 April
- Venerable Jacob of Catania (James the Confessor), Bishop of Catania (c. 730) 24 March
- Monk-martyr Jacob of Hamatoura Monastery, Lebanon (late 13th century) 13 October
- Saint Jacob of Nisibis the Worderworker, Bishop of Antiochia Mygdoniae (4th century) 31 October
- Saint Jacob of Toul, Bishop of Toul (769) West, before the Schism 23 June
- New Hieromartyr Jacob Shestakov of Perm, Priest (1918) 10 December
- Saint Jacob the Ascetic (James), who was demonically deceived and worshipped antichrist, but later repented 13 June
- Venerable Jacob the Confessor (James the Confessor), Bishop, of the Studion (late 8th century) 21 March
- Saint Jacob the Faster, of Phoenicia, Syria (6th century) 4 March
- Saint Jacob, monk of Starotorzhok Monastery in Galich, Kostroma (15th-16th century) 30 May
- Venerable Jacob, Oeconomus of Batheos Rhyakos Monastery 21 October
- Saints Jacut and Guethenoc, disciples of St Budoc, they were driven from Britain to Brittany (5th century) West, before the Schism 8 February
- Martyrs Jadorus and Isidore, who suffered under Decius (3rd century) 4 February
- Saint Jambert (Jænberht, Janbert), fourteenth Archbishop of Canterbury (792) West, before the Schism 12 August
- New Martyr James (1938) 23 March
- Holy Apostle James (44), the brother of St. John the Theologian 30 April
- Saint James (Jakov I), Archbishop of Serbia (1292) 3 February
- Great-Martyr James Intercisus the Persian (421) 27 November
- Venerable James of Mount Athos and his two disciples James the Deacon and Dionysius the Monk (1520) 1 November
- Saint James of Putna, Metropolitan of Moldavia (1778) 15 May
- Saint James of Sasseau, born in Constantinople, he came to France and was ordained in Clermont, later living as a hermit in Sasseau (c. 865) West, before the Schism 19 November
- Venerable James the Ascetic, of Porphyreon (Porphyrianos) in Palestine 28 January
- Saint James the Deacon, companion of St Paulinus of York in his mission to Northumbria (after 671) West, before the Schism 17 August, 18 October
- Saint James the Greater, the son of Zebedee and brother of St John the Evangelist (44) West, before the Schism 25 July
- Hieromartyrs James the Presbyter, and the Deacons Azadanes and Abdicius, of Persia (c. 380) 10 April
- Venerable James the Solitary of Syria (457) 26 November
- Venerable James, Abbot of Zhelezny Borok, Kostroma (1442), and his fellow ascetic St. James of Bryleevsk (15th century) 11 April
- Saint James, ascetic, of Syria (c. 460) 6 February
- Saint James, Bishop and Wonderworker of Rostov (1392) 27 November
- Saint James, first Bishop of Tarentaise (429) West, before the Schism 16 January
- Venerable James, monk of Starotorzhok (Old Torzhok) in Galich, Kostroma (15th-16th centuries) 4 April
- Holy Apostle James, son of Alphaeus (1st century) 9 October
- Holy Apostle James, the Brother of the Lord, first Bishop of Jerusalem (c. 63) 23 October
- Blessed James, youth, of Borovichi, Novgorod, Wonderworker (1540) 22 May
- Martyrs Januarius and Pelagia, of Nicopolis in Armenia (c. 310) 11 July
- Hieromartyrs Januarius, Bishop of Benevento, and his companions (c. 305) 21 April
- Hieromartyrs Januarius, Bishop of Benevento, and his companions, at Pozzuoli (305) West, before the Schism 19 September
- Saints Januarius, Marinus, Nabor and Felix, martyrs in North Africa West, before the Schism 10 July
- Saint Jarlath (Iarlaithe mac Loga), first Bishop of Tuam, founder of the monastery of Cluain Fois, Ireland (c. 540) West, before the Schism 6 June
- Saint Jarlath, first Bishop of Tuam, founder of the monastery of Cluain Fois, near Tuam, Ireland (c. 540) West, before the Schism 26 December
- Apostles Jason and Sosipater, of the Seventy, and their companions, at Corfu (1st century) 28 April
- Saint Jason, Bishop of Damascus, reposed in peace 12 October
- Venerable Jefimija of Devic Monastery (Euphemia), known as "Blessed Stojna" (Zarić), Serbia (1895) 15 February
- Prophet Jeremiah (c. 655 – 586 BC) 1 May
- Venerable Jeremiah of Damascus 29 May
- Saint Jeremias I (Jeremiah I), Patriarch of Constantinople (1546) 13 January
- Hieromartyr Jeroen (Hiero, Iero), hieromonk, at Noordwijk, Netherlands (857) West, before the Schism 17 August
- Blessed Jerome (Hieronymus) of Stridonium (419-420) 15 June, 30 September
- Saint Jerome of Pavia, Bishop of Pavia in Italy (787) West, before the Schism 19 July
- Virgin-martyr Jerusalem of Byzantium, friend of St. Oraiozela, near the Bosphorus (c. 81–96) 26 July
- Venerable Jesse (Ise, Isidore), Bishop of Tsilkani in Georgia, of the Thirteen Assyrian Fathers (6th century) 2 December
- Venerable Joachim (Papoulakis) of Ithaca, monk of Vatopedi (Mt. Athos) and Ithaca (1868) 2 March
- Saint Joachim I, Patriarch of Alexandria (1567) 17 September
- Saint Joachim I, Patriarch of Tarnovo (Turnovo, Trnovo) and Bulgaria (1248) 18 January
- Saint Joachim the New Godbeaerer, of Notenon Monastery in Achaia (17th century) 3 July
- Venerable Joachim, founder of Opochka Monastery, Pskov (c. 1550) 9 September
- Saint Joachim, monk of St. Nicholas monastery of Shartoma (17th century) 23 May
- Saint Joachim, monk of the St. Nicholas-Shartomsk Monastery in Suzdal (1625) 9 September
- Saint Joachim, monk, of Osogovo and Sarandapor, Bulgarian monk (1105) 16 August
- Prophet Joad (III Kings 13:11), who dwelt in Bethel (10th century BC) 30 March
- New Hieromartyr Joanikije (Ioannicius) Lipovac, Metropolitan of Montenegro and the Littoral (1945) 4 June
- New Martyr Joanna Demidova (1937) 7 December
- Saint Joanna the Myrrhbearer (1st century) 27 June
- Venerable Joannicius of Devič, Serbia (1430) 2 December
- Saint Joannicius of Tarnovo, Metropolitan of Tarnovo in Bulgaria (13th century) 14 January
- Venerable Joannicius the Great of Bithynia (834) 4 November
- Venerable Joasaph (Bolotov) of Kodiak, Enlightener of Alaska and the American land (1799) 19 April
- New Hieromartyrs Joasaph (Ioasaf) Boyev, Archimandrite of Nikolskoye Monastery, Moscow; and Nicholas (Nikolay) Saltykov, Hieromonk of the St.... (1937) 27 November
- Saint Joasaph (Ioasaph) Gorlenko, Bishop of Belgorod (1754) 10 December
- New Hieromartyr Joasaph (Shakhov), Abbot, of Popovka (Moscow) (1938) 9 March
- Saint Joasaph Bolotov, Enlightener of Alaska and the American land (1799) 22 January
- New Hieromartyr Joasaph Zhevakhov, Bishop of Mogilev (1937) 22 November
- Saint Joavan, a Romano-Briton who went to Brittany to live with his uncle St Paul of Léon, by whom he was consecrated bishop (ca. 570) West, before the Schism 2 March
- Venerable Job (Joshua in schema) of Anzersk Island, Solovki (1720) 6 March
- Saint Job (Kundrya), Archimandrite, of Malaya Ugolka, Carpatho-Russia (1985) 15 July
- Saint Job Knyaginitsky, founder of Manyava Skete, Ukraine (1621) 29 December
- Venerable Job of Pochaev, Abbot and Wonderworker (1651) 6 May
- Venerable Job of Pochayiv, Abbot and Wonderworker of Pochaev (1651) 28 October
- Venerable Monk-martyr Job the Gorge-dweller (Job of Ushchelsk), on the Mezen River (Solovki) (1628) 5 August
- Righteous Job the Long-suffering (c. 2000-1500 B.C.) 6 May
- Saint Job, Patriarch of Moscow (1607) 19 June
- Prophet Joel (800 BC) 19 October
- New Martyr John (1940) 7 January, 7 January
- Blessed John "the Hairy", Fool-for-Christ of Rostov (1580) 3 September
- Blessed John "the Hairy", Fool-for-Christ, of Rostov (1580) 12 November
- Saints John (674) and George (683), Patriarchs of Constantinople 18 August
- Saint John (Alexeev) of Valaam and New Valamo, Finland, Schema-Abbot (1958) 23 May
- Saint John (Ignatius), Prince of Uglich, tonsured as Ignatius in Vologda (1522) 19 May
- New Martyr John (Koulikas) (1564) 8 April
- Venerable new martyr John (Koulikas) (1564) 18 April
- John (Laba) and Hilarion (Tsurikov), Hieromonks, of Mirzoyan (Kazakhstan) (1937) 22 August
- Venerable John (Lampadistes) of Cyprus (10th century) 4 October
- Saint John (Mavropos), Metropolitan of Euchaita (1100) 14 June, 5 October
- Saint John (Maximovitch), Archbishop of Shanghai and San Francisco (1966) 19 June, 2 July
- New Martyr John (or Nannus) of Smyrna (1802) 29 May
- New Hieromartyr John (Pashin), Bishop of Rylsk (Rila) (1938) 26 February
- New Hieromartyr John (Pommer), Archbishop of Riga in Latvia (1934) 29 September
- Saint John (Tornicus) of Mt. Athos and Georgia (998) 12 June
- John (Troyansky), Bishop of Veliki Luki (1937) 22 August
- Saints John and Benignus, twin brothers and monks at Moyenmoutier in France (707) West, before the Schism 21 July
- Martyrs John and Crispus, priests in Rome who devoted themselves to recovering and burying the bodies of the martyrs, for which they also suffered martyrdom West, before the Schism 18 August
- Martyrs John and Festus, martyrs honoured in Tuscany in Italy West, before the Schism 21 December
- Saints John and Longinus, Wonderworkers of Yarensk, Solovki (1544-1545) 3 July
- Righteous John and Mary of Ustiug (Vologda) (13th century) 29 May
- Saints John and Paul, and Galicanus, martyrs who suffered in Rome (c. 361-363) West, before the Schism 26 June
- Martyrs John and Tarasios, by the sword 7 June
- Saint John Angeloptes, Bishop of Ravenna in Italy 430-433 West, before the Schism 27 November
- Saint John Angelus, born in Venice in Italy, he became a monk at Pomposa (c. 1050) West, before the Schism 31 January
- New Hieromartyr John Anserov, Priest of Alma-Ata (1940) 23 April
- Martyr John Artemov (1937) 1 October
- Saint John Blinov, Confessor (1932) 19 March
- New Hieromartyr John Blyumovich, Priest (1938) 31 March
- New Hieromartyr John Bogoyavlensky, Priest (1941) 11 December
- New Hieromartyr John Boikov, Priest (1934) 6 April
- New Hieromartyrs John Borozdin, Jacob Leonovich, Peter Petrikov, and Nicholas Skvortsov, Priests (1937) 15 September
- New Hieromartyr John Budrin (1918) 21 June
- New Hieromartyr John Bystrov, Priest (1938) 21 September
- Venerable John Calybite (Calabytes) "the Hut-Dweller" of Constantinople, Monk (c. 450) 15 January
- Saint John Camillus the Good, Bishop of Milan, he worked against Arianism and Monothelitism (669) West, before the Schism 10 January
- Venerable John Cassian the Roman, Abbot of Monastery of St Victor, Marseille (435) 29 February, 23 July
- Martyr John Chernoff (1939) 28 March
- New Hieromartyr John Chestnov, Priest (1937) 30 November
- Saint John Chimchimeli of Bachkovo and Gremi (13th century) 10 February
- Saint John Chrysostom (the "Golden-Mouthed"), Archbishop of Constantinople (407) 13 November
- Venerable John Climacus of Sinai, author of The Ladder of Divine Ascent (615) 30 March
- Saint John de Atares (750) West, before the Schism 29 May
- New Martyr John Demidov (1944) 30 June
- Saint John Domovsky, Archpriest in Rostov-on-Don, a confessor of Orthodoxy who firmly denounced the Renovationists (1930) 24 February
- New Hieromartyr John Dunaev, Priest (1938) 26 February
- New Martyr John Emelyanov (1937) 27 November
- New Hieromartyr John Fryazinov, Priest (1938) 9 February
- Saint John Gashkevich, Archpriest of Korma (1917) 18 May
- Saint John Gradenigo, a monk in Cuxa Abbey in the Catalan Pyrenees in Spain, reposed as a hermit near Montecassino (1025) West, before the Schism 5 December
- New Hieromartyrs John Granitov and Leontius Klimenko, Priests; Constantine Zverev, Deacon; and with them 5 Martyrs (1920) 29 January
- Saint John I of Naples, Bishop of Naples in Italy (5th century) West, before the Schism 22 June
- Saint John II, Metropolitan of Kiev (1089) 31 August
- Saint John II, Patriarch of Jerusalem (5th century) 30 March
- Saint John III Doukas Vatatzes the Merciful, Emperor of Nicaea (1254) 4 November
- New Hieromartyr John Ilinsky, Priest (1918) 15 September
- Saint John IV (Chrysostom), Catholicos of Georgia (1001) 3 March
- Saint John IV of Naples, known as 'the Peacemaker', he was Bishop of Naples in Italy, where he is venerated as a patron-saint (835) West, before the Schism 22 June
- New Hieromartyr John Ivanov, Priest (1918) 2 September
- Saint John Jacob the Chozebite, of Neamț (1960) 23 July, 5 August
- Saint John Kaloktenes, Metropolitan of Thebes, the New Merciful (c. 1180) 29 April
- New Hieromartyrs John Kastorsky, Deacon, and John Perebaskin, of Kostroma-Galich (1918) 22 February
- New Hieromartyr John Kochurov, Archpriest, of Chicago and St. Petersburg, First Hieromartyr of the Bolshevik Yoke (1917) 31 October
- New Hieromartyr John Kochurov, Priest (1918) 8 December
- Martyr John Kolesnikov (1943) 4 April
- Martyr John Korotkov (1941) 17 September
- Saint John Kukuzelis of Mount Athos (1360) 1 October
- New Hieromartyrs John Lebedev and John Smirnov, Priests (1937) 27 August
- New Hieromartyr John Letnikov (1930) 12 October
- New Hieromartyr John Maslovsky, Priest, of Verkhne-Poltavka, Amur (1921) 7 September
- Saint John Maximovitch of Tobolsk, Metropolitan of Tobolsk and all Siberia (1715) 10 June
- New Hieromartyr John Mirotvortsiev (1938) 5 March
- Venerable John Moschos, the ascetic writer of ‘The Spiritual Meadow’ (622) 11 March
- New Martyr John Naukliros ("the Navigator"), burned alive on Kos (1669) 8 April
- New Martyr John of Al-Sindiyana, Palestine (1937) 4 March
- Saint John of Autun, a Bishop venerated in Autun, Confessor West, before the Schism 29 October
- Saint John of Bergamo, Bishop of Bergamo, renowned for his learning and great success in fighting Arianism (c. 690) West, before the Schism 11 July
- Saint John of Beverley, Bishop of York (721) West, before the Schism 7 March, 7 May
- New Martyr John of Bulgaria (Raiko-John of Shumena), the goldsmith (1802) 14 May
- Saint John of Cathares, Abbot of Cathares Monastery at Constantinople (839) 27 April
- Saint John of Châlon, third Bishop of Châlon-sur-Saône in France (c. 475) West, before the Schism 9 May
- Saint John of Chinon, born in Brittany, he became a hermit in Chinon in the west of France, where he became the spiritual father of Queen Radegund (6th century) West, before the Schism 27 June
- New Martyr John of Crete, at New Ephesus (1811) 15 September
- Venerable John of Damascus (John Damascene), Monk of St. Sabbas Monastery (749) 4 December
- Venerable John of Egypt, anchorite (4th century) 29 March
- Hieroconfessors John of Galёs, and Moses (Macinic), Priests, of Sibiel, Transylvania (18th century) 21 October
- Saint John of Gorze, Abbot of Gorze (c. 975) West, before the Schism 27 February
- Venerable John of Irenopolis, Bishop of Irenopolis, Cilicia and one of the 318 fathers of Nicaea (c. 325) 4 February
- New Martyr John of Kazan (1529) 24 January
- Venerable John of Khakhuli Monastery, Georgia, called Chrysostom, reposed on Mount Athos (10th-11th century) 10 March
- New Martyr John of Konitsa, Epirus, by beheading (1814) 23 September
- Righteous John of Kronstadt, Wonderworker (1908) 19 October, 20 December
- Venerable John of Lycopolis (John of Thebes), monk (4th century) 6 February
- New Martyr John of Merv, Turkmenistan (early 11th century) 14 July
- New Martyr John of Monemvasia, Peloponnesus, at Larissa (1773) 21 October
- Blessed John of Moscow, Fool-for-Christ (1589) 3 July
- Saint John of Novgorod (Elias, Ilya), Archbishop and Wonderworker of Novgorod (1186) 7 September
- Venerable John of Olympus (John Dermokaitis), in Bithynia (c. 919–944) 17 November
- Saint John of Parma, abbot of Saint John's at Parma from 973 to c. 982, then under Cluniac observance West, before the Schism 22 May
- Saint John of Patalaria Monastery, Confessor and Abbot (8th-9th centuries) 3 August
- Saint John of Pavia, Bishop of Pavia in Lombardy (813) West, before the Schism 27 August
- Saint John of Prislop, Romania (15th-16th centuries) 13 September
- Venerable John of Psichaita the Confessor, of Constantinople (c. 825) 26 May
- Saint John of Ravenna (Giovanni I Angelopte), Bishop of Ravenna and Confessor (494) West, before the Schism 12 January
- Saint John of Reomans (John of Reomay (Réomé)), in Gaul (544) West, before the Schism 28 January
- Venerable John of Rila, founder and Abbot of Rila Monastery, Bulgaria (946) 18 August
- Venerable John of Rufiana, ascetic of the Monasterium Rufianense (San Pedro de Montes), near Astorga, Spain West, before the Schism 16 March
- New Martyr John of Serres (15th century) 12 May
- Saint John of Sezenovo Convent, Recluse, fool-for-Christ (1839) 14 December
- Saint John of Shavta, Bishop of Gaenati (12th-13th century) 9 June
- New Martyr and Confessor John of Sonkajanranta (Johannes (Ivan) Vasileinpoika Karhapää) (1884–1918) 8 March
- Venerable John of St. Sabbas Monastery 7 December
- Saint John of Syracuse (Ioannes), Bishop of Syracuse in Sicily from 595 (c. 609) West, before the Schism 23 October
- Venerable John of the Ancient Caves (John Paleolavrite) in Palestine (8th century) 19 April
- New martyr John of Thessaloniki (1776) 15 February
- New Martyr John of Tourkolekas (1816) 16 October
- New Martyr John of Trebizond, who contested in Akkerman (Asprokastron, Bilhorod-Dnistrovskyi) (1330 or 1492) 12 June
- Saint John of Tula, Fool-for-Christ (1850) 12 January
- New Martyr John of Turnovo (1822) 16 July
- Saint John of Tuy, born in Galicia in Spain, he lived as a hermit near Tuy, where his relics are still enshrined (9th century) West, before the Schism 24 June
- Blessed John of Ustiug, Fool-for-Christ (1494) 29 May
- Saint John of Verona, the successor of St Maurus in Verona in Italy (7th century) West, before the Schism 6 June
- Saint John of Vishnya and Mt. Athos, activist against Uniatism (c. 1630) 16 July
- New Martyr John of Wallachia, at Constantinople (1662) 12 May
- Saint John of Yaransk, monk at Solovki (1561) 24 June
- New martyrs John Pankov, priest, and his children Nicholas Pankov, and Peter Pankov, new martyrs of Orlov (1918) 26 April
- New Hieromartyr John Pankratovich, Priest (1937) 23 September
- New Hieromartyrs John Pavlovsky and Vsevolod Poteminsky, Priests (1937) 6 September
- New Hieromartyr John Pettaya, Priest (1919) 16 January
- New Hieromartyrs John Piankov and Nicholas Yakhontov, Priests (1918) 23 December
- New Hieromartyr John Plekhanov, Priest (1938) 12 March
- New Hieromartyr John Plotnikov, Deacon (1918) 30 July
- Martyr John Popov (1938) 26 January
- Hieromartyr John Preobrazhensky, Deacon (1938) 29 May
- New Hieromartyr John Prigorovsky of Krasnoyarsk, Priest (1918) 17 April
- New Hieromartyr John Prigorovsky, Priest (1918) 21 April
- Saint John Rastorguyev the Barefoot, Fool-for-Christ, of Kiev (1849) 16 December
- New Hieromartyr John Rudinsky, priest (1930) 29 October
- New Hieromartyr John Rumyantsev, Priest; Martyr Constantine Razumov, Priest; Virgin-martyr Anna Serova; and St. Elizabeth Rumyantseva (after 1937) 31 July
- New Hieromartyr John Rybin, Priest (1937) 6 October
- Saint John Scholasticus, Patriarch of Constantinople (577) 21 February
- Saint John Shavteli of Salosi (John of Black Mountain), Georgia (12th-13th century) 1 April
- Martyrs John Shuvalov, Basil Ivanov, Demetry Ilyinsky, Theodore Palshkov, and Demetry Kazamatsky (1938) 4 February
- New Hieromartyrs John Shyshev, Ioasph Panov and Constantine Popov, Priests (1918) 13 August
- New Hieromartyrs John Smirnov and Nicholas Nikolsky, Priests (1937) 24 October
- New Hieromartyrs John Smirnov, Basil Bov, Paul Evdokimov, Jacob Sokolov, Theodore Gusiev, John Baranov, Priests (1937) 22 November
- New Hieromartyr John Smirnov, Deacon (1938) 5 August
- New Hieromartyr John Smirnov, Hieromonk of Bolshoye Mikhailovskoye (Tver) (1938) 23 December
- New Hieromartyr John Solovyev, Priest (1941) 27 July
- New Hieromartyr John Spassky, priest of Tver (1941) 27 April
- Saint John the Almsgiver, of Amphiale, Piræus (1966) 27 January
- Hieromartyrs John the Bishop and James the Presbyter of Persia (345) 1 November
- New Martyr John the Bulgarian, at Constantinople (1784) 5 March
- New Martyr John the Cabinetmaker (John Calphas, "the Apprentice"), by beheading, at Constantinople (1575) 26 February
- Saints John the Cappadocian (520) and Epiphanius (535), Patriarchs of Constantinople 25 August
- Venerable John the Cave-Dweller, ascetic of Sia, Cyprus, Wonderworker 26 September
- Saint John the Chozebite, Bishop of Caesarea in Palestine (532) 3 October, 28 October
- Saint John the Clairvoyant, anchorite of Lycopolis, Egypt (394) 27 March
- Saint John the Cobbler of Olumba, Cairo, and Sinai (7th century) 17 November
- Saint John the Confessor, Metropolitan of Chalcedon (9th century) 18 July
- Martyr John the Confessor, of Egypt, beheaded in Palestine, and with him 40 martyrs (295 or 310) 20 September
- Saint John the Confessor, of Psychaita, on the Bosphorus (c. 825) 7 May
- Saint John the Exarch of Bulgaria (c. 917-927) 31 July
- Saint John the Faster of the Kiev Caves (12th century) 7 December
- Saint John the Faster, Patriarch of Constantinople (595) 2 September
- Venerable John the Godbearer, of Crete, monk (1031) 20 September
- Saint John the Harvester (Theristos), of Calabria (9th century) 24 February
- Venerable John the Hermit (Ivan), of Bohemia (845 or 904) West, before the Schism 24 June
- Venerable John the Hermit of Cilicia (4th century) 30 March
- Saint John the Merciful, Patriarch of Alexandria (c. 616–620) 12 November
- Saints John the Monastic, and John the New, Bishops of Ephesus 3 August
- Venerable John the Much-suffering, of the Kiev Caves (1160) 18 July
- Venerable John the Righteous (John the Hesychast), disciple of St. Gregory of Decapolis (c. 820-850) 18 April
- Saint John the Russian the Confessor, whose relics are on the island of Euboea (1730) 27 May
- Saint John the Saxon, born in Saxony in Germany, he restored monasticism in England after the Danish attacks, Abbot of Athelney (895) West, before the Schism 22 February
- Venerable John the Short of Egypt (John Kolobos, John the Dwarf) (c. 407) 9 November
- Saint John the Silent (John Hesychastes), Bishop of Colonia (Taxara) in Armenia, and later a monk of Saint Sabbas (Sava's) Monastery (558) 3 December
- Venerable John the Silent (John Hesychastes), Bishop of Colonia (Taxara) in Armenia, and later a monk of St. Sabbas Monastery (558) 30 March
- Blessed John the Soldier (c. 361) 29 July
- Martyr John the Soldier, at Tralles in Asia Minor (361-363) 30 July
- Saint John the Soldier, of Egypt (6th-7th century) 12 June
- Saint John the Solitary of Jerusalem (586) 19 June
- Saint John the Syrian of Pinna, a Syrian monk who settled in Pinna near Spoleto in Italy, became abbot of a large monastic colony there for forty-four years (6th century) West, before the Schism 19 March
- New Martyr John the Tailor of Thasos, at Constantinople, by beheading (1652) 20 December
- New Martyr John the Tailor, of Ioannina, at Constantinople (1526) 18 April
- Saint John Theristes ("the Harvester") of Stylos in Calabria (d. 1129) West, before the Schism 23 February
- St. John Tolaius, Patriarch of Alexandria (482) 29 April
- New Hieromartyrs John Tomilov, Timothy Izotov, Priests (1938) 3 February
- Saint John Triantaphyllides, the New Chrysostom and Merciful, of Chaldia in Asia Minor (1903) 13 June
- New Hieromartyrs John Uspensky and Euthymius Tikhonravov, Priests (1938) 22 January
- Saint John V (Chrysostom), Catholicos of Georgia (1048) 3 March
- New Hieromartyrs John Vasiliev, Boris Bogolepov, Michael Skobelev, Vladimir Chekalov, Benjamin Blagonadezdin, Constantine Tverdyslov, Priests (1937) 18 September
- Saint John Vasiliev, Confessor (1932) 23 November
- New Hieromartyr John Vasiliev, priest (1942) 4 May
- New Hieromartyr John Vechorko, Priest (1933) 4 April
- New Hieromartyr John Vilensky, Priest of Semyonovskoe (1918) 3 May
- New Hieromartyr John Vilensky, Priest of Yaroslavl-Rostov (1918) 28 October
- Saint John Vincent, born in Ravenna, he became a monk at St. Michael in Chiusa, then a hermit on Monte Caprario , finally he became Bishop nearby (1012) West, before the Schism 21 December
- New Hieromartyr John Vishnevsky, Priest (1920) 19 November
- Saint John Vladimir, King of Serbia, Martyr, Wonderworker, whose relics are at Elbasan (1015) 22 May
- New Hieromartyr John Vladimirsky of Tver (1937) 25 November
- New Hieromartyr John Zasyedatelev, Priest (1942) 16 October
- New Hieromartyr John Zemlyani, Priest of Alma-Ata (1937) 17 December
- New Hieromartyr John Znamensky, Priest (1923) 8 March
- Martyrs John Zolotov, and Nicholas Gusev (1937) 26 September
- Saint John, a priest in Rome, beheaded under Julian the Apostate (362) West, before the Schism 23 June
- Venerable Martyr John, Abbot of Monagria Monastery, near Cyzicus (761) 4 June
- Martyr John, Abbot of the Zedazeni Monastery, Georgia (9th century) 12 December
- Saint John, Abbot, of Svyatogorsk Monastery (1970) 11 September
- Saints John, Andrew, Heraclemon, and Theophilus, hermits of Egypt (4th century) 12 June
- Saints John, Antioch, Antoninus, Moses, Zebinas, Polychronius, Moses (another), and Damian, ascetics near Cyrrhus in the Syrian desert (5th century) 23 February
- Saint John, Bishop and Wonderworker of Polybotum (Polybotus), Phrygia Salutaris (716) 4 December
- Saint John, Bishop of Gothia in the Crimea (787) 19 May
- Venerable John, Bishop of Gothia in the Crimea (c. 787) 26 June
- Saint John, Bishop of Karpathos (7th century) 25 August
- Saint John, Bishop of Manglisi, Georgia (1751) 28 March
- Saint John, Bishop of Suzdal (1373) 15 October
- Venerable John, called Barsanuphius, of Nitria in Egypt (5th century) 29 February
- Venerable John, disciple of Venerable Gregory of Decapolis (820) 11 April
- Saint John, Fool-for-Christ, of Verkhoturye (1701) 16 April
- Saints John, Heraclemon, Andrew and Theophilus, of Oxyrhynchus, hermits of Egypt (4th century) () 2 December
- Hieromartyr John, in Persia (4th century) 29 November
- Saint John, Metropolitan of Zichnon (Zichne), founder of the Monastery of the Forerunner on Mt. Menikion (north-east of Serres) (1333) 12 December
- New Hieromartyrs John, Nicholas, Jacob, Peter, John, John (1938) 22 January
- New Hieromartyr John, Priest (1919) 2 December
- Saint John, recluse of Svyatogorsk Monastery (1867) 11 August
- Saint John, recluse, of the Pskov Caves (1616) 24 October
- Prophet Jonah (8th century BC) 21 September
- Venerable Jonah (1480), Mark (15th century), and Bassa of the Pskov-Caves Monastery 29 March
- Prophet Jonah (8th century B.C.) 22 September
- New Hieromartyr Jonah (Lazarev), Bishop of Nevel, Pskov (1937) 8 October
- Venerable Saint Jonah (Miroshnichenko) of Kyiv (Peter in Schema), Wonderworker, founder of Holy Trinity Monastery in Kyiv (1902) 9 January
- New Hieromartyr Jonah (Sankov) the Athonite (1938) 4 July
- New Hieromartyr Jonah (Sankov), Hieromonk, of Alpatievo, Moscow (1938) 21 June
- Martyrs Jonah and Barachisius and those with them in Persia (330) 28 March
- Saints Jonah and Bassian, monks of Pertomsk in Solovki (1561) 12 June
- Saints Jonah and Nectarius, monks, of Kazan (16th century) 4 October
- Saint Jonah Atamansky, Archpriest of Odessa, Wonderworker (1924) 17 May
- Saint Jonah of Klimetzk, founder of Klimets Monastery, Olonets (1534) 6 June
- Saint Jonah of Manchuria, Bishop of Hankou, Manchuria, Wonderworker (1925) 7 October
- Saint Jonah of Moscow, Metropolitan and Wonderworker of Kiev, Moscow, and all Russia (1461) 15 June
- Venerable Jonah the Sabbaite, the Presbiter (9th century), father of Sts. Theophanes the Hymnographer and Theodore Graptus 21 September
- Venerable Jonah the Sabbaite, the Presbyter (9th century), father of Sts. Theophanes the Hymnographer and Theodore Graptus 22 September
- Venerable Jonah, Abbot of Klimets Monastery, Olonets (1534) 28 March
- Saint Jonah, archbishop of Novgorod (1470) 9 March
- Saint Jonah, Archbishop of Novgorod (1470) 5 November
- Saint Jonah, Bishop of Perm (1470) 6 June
- New Martyr Jonah, disciple of Saint Tryphon of Pechenga (1589–1590) 15 December
- Saint Jonah, Metropolitan of Kiev, Moscow, and all Russia (1461) 31 March
- Saint Jonas (Yon), a companion or disciple of St Dionysius of Paris in France, he was martyred there (3rd century) West, before the Schism 22 September
- Martyrs Jonas and Barachisius, and companions, in Persia, under Shapur II (330) 29 March
- Saint Jonatus, a monk at Elnone in Belgium; Abbot of Marchiennes (c. 643-652) and then of Elnone Abbey (c. 652-659) West, before the Schism 1 August
- Martyr Jonilla and her infant son Turbo (c. 161-180) 17 January
- New Martyr Jordan of Trebizond, at Constantinople (1650) 2 February
- Saint Jordan the Wonderworker 2 May
- Venerable Joseph 'Gerontogiannis', monk of Kapsa Monastery on Crete (1874) 7 August
- New Hieromartyr Joseph (Baranov), Hieromonk of the Tolga Monastery (Yaroslavl) (1918) 8 August
- Saint Joseph (Litovkin) of Optina, Hiero-schema-monk of Optina Monastery (1911) 9 May
- New Hieromartyr Joseph (Petrovykh), Metropolitan of Petrograd (1937) 7 November
- Venerable Joseph (Stoyka) the Confessor, Bishop of Maramureș, Romania (c. 1711) 24 April
- Saint Joseph Analytinus of Raithu Monastery (4th century) 14 January
- New Hieromartyr Joseph Bespalov, and with him 37 Martyrs (1921) 5 January
- Saint Joseph I Galesiotes, Patriarch of Constantinople (1283) 30 October
- New Hieromartyr Joseph III Antonopoulos, Metropolitan of Thessalonica (1821) 3 June
- Saint Joseph Naniescu of Suceava, Metropolitan of Moldova, Romania (1902) 26 January
- New Martyr Joseph of Aleppo in Syria (1686) 4 February, 4 February
- Righteous Joseph of Arimathea, who buried the Master Christ (1st century) 31 July
- Venerable Joseph of Bethlehem, monk 15 June
- Saint Joseph of Văratec Monastery, Romania (1828) 16 August
- Saint Joseph of Verona, Bishop of Freising (764) West, before the Schism 17 January
- Saint Joseph of Volokolamsk, founder of Volokolamsk (Volotsk) Monastery (1515) 13 February
- Venerable Joseph Samakos (Samakus) the Sanctified of Crete (1511) 22 January
- New Hieromartyr Joseph Schensnovich, Deacon (1937) 9 November
- New Hieromartyr Joseph Sikov, Priest (1918) 14 June
- New Hieromartyrs Joseph Smirnov, Protopresbyter, and Vladimir Ilinsky, Priest (1918) 22 February
- Saint Joseph the Betrothed (1st century) West, before the Schism 19 March
- Saint Joseph the Confessor (Joseph I the Studite), Archbishop of Thessalonica (832) 14 July
- Righteous Joseph the Fair (the All-Comely), son of Jacob, Patriarch (c. 1700 BC) 31 March
- Venerable Joseph the Hymnographer, of Sicily (883) 3 April, 4 April
- Saint Joseph the Merciful, Metropolitan of Moldova (1902) 13 January
- Venerable Joseph the Much-ailing, of the Kiev Caves (14th century) 4 April
- Saint Joseph the New of Cappadocia (c. 1860) 11 January
- Saint Joseph the New of Partoёs, Metropolitan of Timișoara, Romania (1656) 15 September
- New Hieromartyr Joseph Zograph of Dionysiou, Hieromonk, at Mt. Athos (1819) 17 February
- Saint Joseph, Abbot of Alaverdi Monastery in Georgia (570) 15 September
- Venerable Joseph, Elder and Wonderworker, of Khevi, Georgia (1763) 7 October
- Hieromartyr Joseph, first Metropolitan of Astrakhan (1672) 11 May
- Venerable Joseph, founder of Volokolamsk (Volotsk) Monastery, Wonderworker (1515) 9 September
- Saint Joseph, founder of Zaonikiev Monastery, Vologda (1612) 21 September
- Righteous Joshua, the son of Nun (c. 16th century BC) 1 September
- Monk-martyrs Josiah and Joseph, of Mt. Kharasam, Persia (c. 341) 8 April
- Righteous Jovan (John) Branković, King of Serbia (1502-1503), and his parents Righteous Stefan (Stephen) Branković the Blind, Despot of Serbia (1446, 1468... (1520) 10 December
- Monk-martyr Jovan of Stjenica (1462) 10 August
- Martyr Jovinian, the lector of St. Peregrine of Auxerre (c. 304) West, before the Schism 5 May
- Saints Jovinus and Basileus, two martyrs who suffered in Rome under Gallienus and Valerian, buried on the Latin Way (258) West, before the Schism 2 March
- Saint Jucunda, a holy virgin in Reggio in Aemilia in Italy and a spiritual daughter of St Prosper, Bishop of that city (466) West, before the Schism 25 November
- Saint Jucundian, a martyr in North Africa West, before the Schism 4 July
- Saint Jucundus of Bologna, Bishop of Bologna in Italy (485) West, before the Schism 14 November
- Holy Apostle Jude, the Brother of the Lord (c. 80) 19 June
- Saint Judicaël, son of Hoel and king of Domnonia and Brittany, much loved by his people, spent the last twenty years of his life in the monastery of Gäel... (658) West, before the Schism 17 December
- Saint Judoc (Judocus, Judganoc, Josse) of Ponthieu, Priest, brother of King Judicäel of Brittany, became a hermit in Villiers-Saint-Josse (c. 668) West, before the Schism 13 December
- Virgin-martyr Julia of Carthage, by crucifixion, at Corsica (c. 440) West, before the Schism 16 July
- Saint Julia of Corsica the martyr, who was crucified (440) West, before the Schism 22 May
- Saint Julia of Mérida, a martyr together with Saint Eulalia, in Mérida in Spain under Diocletian (304) West, before the Schism 10 December
- Saint Julia of Troyes (c. 272) West, before the Schism 21 July
- Martyrs Julian and his disciple Eunos (Kronion), at Alexandria (250- 252) 27 February
- Martyr Julian and his wife Basilissa, and with them Martyrs Celsius, his mother Marcianilla, Anastasius, the priest Anthony, seven brothers, and twenty... (283-305) 21 June
- Martyrs Julian and his wife, Basilissa, and with them Celsius and his mother, Marcionilla, Anastasius, the priest Anthony, seven brothers, and twenty prison... (283–305) 8 January
- Saint Julian of Alexandria, Bishop of Alexandria (189) 4 March
- Martyr Julian of Anazarbus, in Cilicia (305) 16 March
- Saint Julian of Auvergne (3rd century) West, before the Schism 28 August
- Venerable Julian of Dagaz (Dogazou), of the Dagouta Church in Constantinople 12 June
- Martyr Julian of Dalmatia (c. 138-161) 28 July
- Martyr Julian of Emesa the Physician, and Bishop Silvanus (312) 6 February
- Martyr Julian of Galatia and 40 martyrs with him (4th century) 12 September
- Martyr Julian of Heliopolis in Syria (c. 362) 22 August
- Saint Julian of Le Mans, Bishop of Cenomanis (Le Mans) in (Gaul) (1st or 3rd century) West, before the Schism 13 July
- Saint Julian of Le Mans, venerated as the first Bishop of Le Mans in France (3rd century) West, before the Schism 27 January
- Saint Julian of Lyon, a martyr venerated in Lyon in France West, before the Schism 13 February
- Saint Julian of Sora, martyred under Antoninus Pius (c. 150) West, before the Schism 27 January
- Martyr Julian of Tarsus in Cilicia (c. 284-305) 21 June
- Saint Julian of Toledo, Archbishop of Toledo and Confessor (690) West, before the Schism 8 March
- Saint Julian the Deacon of Aegina (391) 7 January
- Venerable Julian the Hermit (Julian Sabas)), of the Euphrates, in Mesopotamia (4th century) 18 October
- Saint Julian the Hospitaller West, before the Schism 12 February
- Hieromartyrs Julian the Presbyter, and Caesarius the Deacon, at Terracina (1st century or 268) 7 October
- Venerable Julian, ascetic in Syria (370) 9 June
- Martyr Julian, beaten to death 2 September
- Martyr Julian, by being dragged through thorns 18 May
- Martyr Juliana 27 May
- Martyrs Juliana and her son Saturninus, by fire, in Petra, Constantinople 22 June
- Martyr Juliana near Strobilos in Lycia 18 August
- Saint Juliana of Bologna (435) West, before the Schism 7 February
- Virgin Martyr Juliana of Nicomedia, and with her 500 men by the sword, and 130 women by beheading (304) 21 December
- Saint Juliana of Pavilly, A servant girl who became a nun and then abbess at Pavilly in France (c. 750) West, before the Schism 11 October
- Righteous Juliana the Merciful of Lazarevo and Murom (1604) 2 January
- Saint Juliana, Princess of Vyazma (Novotorzhok) (1406) 21 December
- Venerable Julitta (Julia) of Tabennisi in Egypt (4th century) 14 June
- Martyr Julitta (Juliet), at Caesarea in Cappadocia (304-305) 31 July
- Martyr Julitta of Caesarea in Cappadocia (4th century) 30 July
- Martyrs Julius and Aaron, Protomartyrs of Wales, suffered in Caerleon-on-Usk under Diocletian (304) West, before the Schism 1 July
- Saint Julius I, Pope of Rome, defended St Athanasius against his Arian accusers, and also built many churches (352) West, before the Schism 12 April
- Saint Julius of Aegina (Julius of Novara), missionary priest to northern Italy (401) 31 January
- Saints Julius of Novara, presbyter, and his brother Julian the Deacon (5th century) 21 June
- Martyr Julius the Veteran, at Dorostolum in Moesia (297) 27 May
- Saint Julius, an early martyr in Rome (c. 190) West, before the Schism 19 August
- Martyrs Julius, Potamia, Crispin, Felix, Gratus and Companions - 12 martyrs who suffered in Thagura in Numidia in North Africa under Diocletian (302) West, before the Schism 5 December
- Martyr Julius, Roman soldier, by beheading, at Dorostolum in Mysia (Asia Minor) (302) 26 May
- Saint Junian of Mairé, founder of the monastery of Mairé in Poitou in France and later a hermit in Chaulnay (587) West, before the Schism 13 August
- Saint Junian, a hermit in Commodoliacus (now Saint-Junien), near Limoges in France (5th century) West, before the Schism 16 October
- Saint Jurmin, an East Anglian prince, son or nephew of King Anna of East Anglia (653) West, before the Schism 23 February
- Saint Just of Penwith, monk, of Cornwall (5th century) West, before the Schism 13 July
- Saints Justa and Rufina of Seville, two sisters, potters by trade, martyred under Diocletian and venerated as the main patron-saints of Seville (287) West, before the Schism 19 July
- Martyrs Justa, Justina and Henedina, in Sardinia (c. 130) West, before the Schism 14 May
- Saint Justa, nun 26 April
- Venerable Justin 17 November
- Saint Justin (Popovic), Archimandrite of Ćelije Monastery in Serbia and Confessor of Traditional Orthodoxy (1979) 25 March, 7 April
- Saint Justin Popović, Archimandrite of Ćelije Monastery in Serbia (1979) 1 June
- Saint Justin the Confessor, a priest in Rome who devoted himself to burying the bodies of martyrs and was eventually martyred himself (259) West, before the Schism 17 September
- Martyrs Justin the Philosopher (Justin Martyr), Chariton, Charita, Euelpistus, Hierax, Peonus, Valerian (Liberianus), and Justus at Rome (166) 1 June
- Saint Justin, Bishop of Chieti, Italy (c. 540) West, before the Schism 1 January
- Saint Justina of Padua, a virgin-martyr in Padua in Italy under Diocletian (c. 300) West, before the Schism 7 October
- Monk-martyr Justinian of Ramsey Island (Iestin), South Wales (560) West, before the Schism 5 December
- Saint Justinian the Emperor (565) and his wife St. Theodora (548) 14 November
- Martyrs Justus and Abundius (283) West, before the Schism 14 December
- Martyrs Justus and Matthew, and Eugene, at Rome (305) 21 July
- Saints Justus and Pastor, two brothers, aged respectively thirteen and nine, scourged and beheaded at Alcalá in Spain under Diocletian (c. 304) West, before the Schism 6 August
- Saint Justus of Beauvais, a child-martyr aged nine, he was venerated in Beauvais in France (287) West, before the Schism 18 October
- Saint Justus of Canterbury, the fourth Archbishop of Canterbury, Confessor (627–631) West, before the Schism 10 November
- Saint Justus of Lyon, Bishop of Lyon (390) West, before the Schism 2 September, 14 October
- Saint Justus of Poland, one of four hermit-brothers in Poland - Sts Benedict, Andrew, Barnabas and Justus (1008) West, before the Schism 9 July
- Saint Justus of Trieste, sentenced to death by drowning (293) West, before the Schism 2 November
- Saint Justus of Urgell, first recorded Bishop of Urgell, in Catalonia in Spain (527) West, before the Schism 28 May
- Martyr Justus, a soldier martyred in Rome (1st century) 14 July
- Saint Justus, Bishop of Alexandria (130) 6 June
- Virgin-Martyr Juthwara of Cornwall (6th or 8th century) West, before the Schism 28 November
- Saint Juthwara, sister of St. Sidwell; she was of British descent and lived in Devon in England (7th century) West, before the Schism 1 July
- New Hieromartyr Juvenal (Maslovsky), Archbishop of Ryazan (1937) 12 October
- Martyr Juvenal of Benevento (132 AD) West, before the Schism 7 May
- Saint Juvenal of Jerusalem, Patriarch of Jerusalem (458) 2 July
- Saint Juvenal of Narni (c. 369/377) West, before the Schism 3 May
- New Hieromartyr Juvenalius (Maslovsky), Bishop of Riazan (1937) 11 October
- Hieromartyr Juvenaly of Alaska (1796) 24 September
- Saint Juvenaly of Alaska, Proto-martyr of America and Alaska (1796) 2 July
- Martyrs Juventinus and Maximinus (361) 12 October
- Martyrs Juventinus and Maximinus, soldiers, at Antioch (361-363) 5 September, 9 October
- Saint Juventius of Pavia, Bishop of Pavia (1st century) West, before the Schism 8 February
- Saint Juventius of Pavia, first Bishop of Pavia, Italy (1st century) West, before the Schism 12 September
- Martyr Juventius, in Rome West, before the Schism 1 June